482 



ON SEEDLINGS 



prolonged at the base in order to occupy the available space 

 in the bluntly pointed upper end of the seed, while they at the 

 same time accommodate the stout radicle in the sinus. Alche- 

 milla aphanoides, also belonging to the Poterieae, has oval, 

 obtuse, entire, petiolate cotyledons, with the petioles connate 

 and sheathing at the base, and therefore agrees with the pre- 

 vailing type of cotyledon 

 in the Order rather than 

 with its allies. The first 

 leaf is trifid with entire 

 segments ; the second 

 more deeply so with the 

 middle lobe tridentate ; 

 and the next three are 

 tripartite with cuneate, 

 variously toothed seg- 

 ments; 



Spiraea callosa, Thunb. 

 var. (fig. 311). 



Primary root slender, 

 flexuous, giving off secondary 

 rootlets, yellowish. 



Hypocotyl erect, terete, 

 or ascending, short, glabrous, 

 pale green, 3-6 mm. long, 

 very slender. 



Cotyledons small, petio- 

 late, glabrous, pale green ; 

 lamina 2*5 mm. long, 1*5 

 mm. broad; petiole 1 P 5 mm. 

 long. 



Stem shrubby, wiry 

 erect, flexuous, pubescent 



with upcurved and incurved hairs, pale green, soon becoming 

 yellowish, ultimately brown ; 1st internode T25 mm. long ; 2nd 

 2 mm. ; 3rd 5 mm. ; 4th 7 mm. ; 5th 7 mm. ; 6th 1 cm. ; 7th 

 6'5 mm. ; 8th 5 mm. 



Leaves simple, cauline, alternate, exstipulate, petiolate, sparsely 

 pubescent, ultimately subglabrous except on the principal nerves and 

 the margin ; stipules obsolete or very caducous ; petioles sbort, 

 sballowly channelled on tbe upper side, pubescent. 



FIG. 811. SpireBd callosa. Nat. size. 



